Skip header and navigation

3 records – page 1 of 1.

Supplementary fibre supplies for the manufacture of MDF and particleboard. Part IV. Effect of different raw materials on wood acidity and resin reactivity

https://library.fpinnovations.ca/en/permalink/fpipub39113
Author
Deng, James
Wang, X.
Wan, Hui
Zhang, S.Y. (Tony)
Date
July 2008
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Deng, James
Wang, X.
Wan, Hui
Zhang, S.Y. (Tony)
Date
July 2008
Material Type
Research report
Physical Description
12 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Resin
Particle boards
Acid
Series Number
General Revenue Report Project No. 5326
5326
Location
Québec, Québec
Language
English
Abstract
A study was carried out to characterize the raw materials and their corresponding wood fibres produced in an industrial MDF mill. Six raw wood materials with the typical mixture of softwood and hardwood species used in the mill and six fibre samples were collected. The characterization was carried out to test the pH, acid buffer capacity and UF resin gel time in the presence of wood flours either from raw wood or wood fibres. The conclusions are made based on the testing results:
Variations of pH, acid buffer capacity and UF resin gel time (in the presence of wood) existed between different batches of raw wood materials and wood fibres.
There was no obvious linear correlation between raw wood and its corresponding wood fibre in terms of their pH, acid buffer capacity and the gel time of UF resin.
With the six wood fibre samples studied, there was no obvious correlation between pH and acid buffer capacity, or between pH and UF resin gel time. This suggests that pH would not be a good indicator to predict the UF resin reactivity with various wood fibres.
To some extent, a linear correlation existed between the acid buffer capacity of the wood fibre and the gel time of UF resin. However, it would not be practical to use the acid buffer capacity to predict the UF resin reactivity with wood fibre due to the tedious test procedure, which is a result of the technology currently used. However, with limited test samples and within a short period of time (six wood / fibre samples within 12 days), no large variations were observed for pH, acid buffer capacity and gel time. Further study might be needed if the raw material differences for a longer time period and the seasonal effect are required.
Fibreboard - Manufacture
Particleboard
Fibres
Acidity
Resin
Documents
Less detail

Effect of resin application sequence, content, and powder/liquid combination ratio on OSB performance

https://library.fpinnovations.ca/en/permalink/fpipub42314
Author
Wang, Xiang-Ming
Wan, Hui
Date
July 2005
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Wang, Xiang-Ming
Wan, Hui
Date
July 2005
Material Type
Research report
Physical Description
43 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Resin
Oriented strandboard
Application
Series Number
General Revenue Project No. 2689
Location
Sainte-Foy, Québec
Language
English
Abstract
Powder and liquid phenol-formaldehyde (PF) combination binder system has been commonly used in North America for oriented strand board (OSB) manufacturing. This binder system has shown its suitability for improving resin efficiency and bond quality as compared with either powder PF (PPF) or liquid PF (LPF) resin. This study was conducted to investigate the effect of resin application sequence (LPF-PPF-LPF, LPF-PPF, PPF-LPF), resin content (3.0%, 5.5%, 8.0%), and PPF/LPF combination ratio (50:50, 65:35, 80:20) on strand board performance. Board properties evaluated include internal bond (IB), thickness swelling (TS), water absorption (WA), dry and wet modulus of rupture (MOR), dry modulus of elasticity (MOE), edgewise shear, and compression shear strength. In addition, a non-destructive test method (TROBEND) developed at Forintek was also used to measure the modulus of elasticity (MOE) and shear modulus of elasticity (G). Response Surface Methodology (RSM) was used in the experiment design. Significant response surface models were established for individual panel properties, including the linear model for IB, dry MOR, dry MOE, and compression shear, as well as the quadric model for TS, WA, and wet MOR, and 2FI (two factor interaction) for edgewise shear. ANOVA for response surface model indicated that the resin content was a significant model term for IB, TS, dry MOR and MOE, wet MOR, and compression shear properties. An increase in resin content improved these board properties. Powder/liquid ratio was a significant model term for TS, WA, and wet MOR. Resin application sequence was not a significant model term for any panel property, but its interaction with resin content was a significant model term for edgewise shear property. In most cases, the interactions between experimental variables were not significant model terms for predicting panel properties, but they still revealed some trends. Regarding Sequence 3 (PPF-LPF), 50:50 PPF/LPF ratio (lower level) resulted in higher IB, dry MOR, and compression shear, while 80:20 PPF/LPF (higher level) yielded lower WA and higher dry MOE. For Sequence 2 (LPF-PPF), 65:35 PPF/LPF ratio (middle level) favoured TS, while 50:50 PPF/LPF ratio (lower level) favoured wet MOR. Sequence 1 (LPF-PPF-LPF) combined with 50:50 PPF/LPF ratio (lower level) also gave lower WA values. In general, an increase in resin content improved the board properties with the above combinations. In addition, Sequence 3 (PPF-LPF), with 3.0% resin (lower level), yielded higher edgewise shear strength regardless of resin application sequence. An attempt was made to correlate the panel mechanical properties measured using both destructive and non-destructive test methods. The strongest correlation was observed between IB and compression shear (R2=0.70), followed by TORBEND G with modulus of elasticity (TORBEND MOE) (R2=0.40), and TORBEND G with compression shear (R2=0.28) and with IB (R2=0.26). However, no correlation seemed to exist between MOE (static bending) and TROBEND MOE. An image analysis indicated that an increase in resin content significantly increased resin coverage on strand surface. At each resin content (3.0%, 5.5%, and 8.0%), a decrease in PPF/LPF ratio in Sequence 1 (LPF-PPF-LPF) or an increase PPF/LPF ratio in sequence 3 (PPF-LPF) seemed to result in higher resin coverage. Resin coverage seemed to correlate to TS (R2=0.45), IB (R2=0.42), compression shear (R2=0.39), TORBEND G (R2=0.39), dry MOR (R2=0.25), wet MOR (R2=0.25), and dry MOE (R2=0.18). However, resin coverage did not seem to correlate to WA, TORBEND MOE, or edgewise shear properties.
Resin application
OSB
Documents
Less detail

Applications des systemes de vision dans l'industrie du bois de sciage

https://library.fpinnovations.ca/en/permalink/fpipub1874
Author
Levesque, Y.
Date
March 1990
Edition
38396
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Levesque, Y.
Date
March 1990
Edition
38396
Material Type
Research report
Physical Description
23 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Digitalization
Subject
Visual efficiency
Systems
Application
Series Number
E-1194
Location
Ottawa, Ontario
Language
French
Abstract
Systems de Vision
Applications
Documents
Less detail